At 7 weeks, your pups are probably still teething. I actually consider it to be more or less essential to give them something to chew on at this stage in their growth. It doesn't have to be a bone per se; there are plenty of different toys and such that suit the purpose admirably. We have several toys that we use for the purpose, including plastic rings, squeak toys and even a length of thick, sturdy rope (knotted at both ends to minimize fraying). All of those are available at a pet store along with other products like rawhide bones. Pay careful attention to what you buy, as you don't want to give the pups something that they can choke on. Whatever it is, has to be strong enough to withstand a pup's constant gnawing without fragmenting into pieces that can get stuck in your pup's throat.
While on the subject, I feel obliged to let you know that you should resist the urge to play tug of war with your pups. They may try to, but if they do always let go. Tugging like that can encourage aggressive behaviour and it can also damage their new teeth, which may not be properly set at the moment.
It sounds like you've got the night training well in hand. As to the food thing, some dogs will get a bit finicky if you change foods. If you really want to switch their food, the easiest way to do it is to start by mixing the new stuff in with the Purina, then gradually reduce the amount of Purina you're using into they're eating just the new food. That way they get used to the taste without being hit with it all at once. It's your choice, but I wasn't exaggerating above. I don't know the exact number of litters that my step-dad has had, as I lost count a long time ago. I do know that there have been well over a hundred pups in the last decade and a half or so that he's been breeding. I don't recall a single one ever having any sort of issues with Purina chow.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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